O melhor lado da ct scan

Overtesting has also created a new, unanticipated problem: overdiagnosis. This isn’t misdiagnosis—the erroneous diagnosis of a disease. This is the correct diagnosis of a disease that is never going to bother you in your lifetime. We’ve long assumed that if we screen a healthy population for diseases like cancer or coronary-artery disease, and catch those diseases early, we’ll be able to treat them before they get dangerously advanced, and save lives in large numbers.

Then I showed her the pathology report. She did have a thyroid cancer, a microcarcinoma about the size of this “Este,” with no signs of unusual invasion or spread. I wished we had a better word for this than “cancer”—because what she had was not a danger to her life, and would almost certainly never have bothered her if it had not been caught on a scan.

All the same, she thanked me profusely for relieving her anxiety. I couldn’t help reflect on how that anxiety had been created. The medical system had done what it so often does: performed tests, unnecessarily, to reveal problems that aren’t quite problems to then be fixed, unnecessarily, at great expense and pelo little risk.

What’s more, the value of any test depends on how likely you are to be having a significant problem in the first place. If you have crushing chest pain and shortness of breath, you start with a high likelihood of having a serious heart condition, and an electrocardiogram has significant value.